"Charlie Morgan" wrote in message
...
On Fri, 19 Jan 2007 18:51:35 GMT, "JoeSpareBedroom"
wrote:

"Chuck Gould" wrote in message
groups.com...

JoeSpareBedroom wrote:


Can't you use the electronic things to just view the maps, but ignore
GPS
and focus on your compass instead, as you would with paper maps?

Not on most plotters that I'm familiar with. The plotter needs geo
coordinates to know which
chart to "draw" on the screen.

It would be possible to store images of charts on a PC system and bring
them up manually as needed. That's going to be far more common in the
future, now that we have the privilege to download charts directly from
NOAA. PC Nav functions that place an icon of the vessel on the screen
or automatically select the proper chart from a library based on GPS
information would be as useless as a GPS plotter if somebody took out
the satellites.

I suspect the US and maybe one or two traditionally friendly countries
have had the technology to take down a satellite for rather a while
now, but remembering that Chinese strategic planning works in decades
and generations (rather than in fiscal quarters) I remain slightly ill
at ease with the Chinese capablity to render our nav systems useless-
to say nothing of the other high tech advances becoming available to
their military. For now the Chinese plan appears to be to buy us,
rather than conquer us. :-)


I find it odd that none of the toys allow you to simply view a chart that
you've already downloaded. What a dumb omission. Let the user use the
controls to designate a chart already loaded into the toy.


I can view all of the charts on both of my Garmins without a satellite
signal. GPSMAP76s and 276c

CWM

That makes more sense. It allows for the possibility that even if the
satellites vanish, the buoys and landmarks still remain. I don't use any GPS
navigation thing on my yacht, but miraculously, I'm still able to get home
at night using sightings of 3 antenna towers, and huge string of lights on a
roller coaster at the water's edge.